35years old and American. As someone who moved alot in childhood, I had to do this THREE times.
Once was the egg for a week. (7th grade) Teacher drew different faces on each, a number and her initials on the "back". Photographed each egg and each photo had the name of the student that got that egg written on it. We had to make baskets to carry them in and they had to be with us in school for every class. At the end of the week,, they were inspected for cracks first, compared to the photographs to make sure it wasn't a student-drawn fake, then cracked open to see if the innards were "normal" or "scrambled".
Second time was the bag of flour. (8th grade) Different school. Teacher signed the bags, didn't care about anything really, and as long as your flour's bag was intact you passed.
3rd time was an actual mechanical baby (10th grade, two schools later). They audibly cry. Loudly. There's cards labeled "feeding" "burp" "change diaper" "bathe" and "attention". When the robot baby cries, you have to stick each of the cards in the slot on its back until the "correct" card stops the crying. You can turn them off, but they record everything including how long it takes for the cards to be inserted after crying starts and if it's turned off at all. And yes, the crying was set to be random so that you would get woken up in the middle of the night multiple times.